<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/img/heima.png" alt="" />
        <span>电商后台管理系统</span>
      </div>
      <el-button type="info" @click="logout" round>退出</el-button>
    </el-header>

    <!-- 页面主体 -->
    <el-container>
      <!-- 侧边栏 -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <!-- 折叠按钮 -->
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!-- 侧边栏菜单 -->
        <el-menu
          background-color="#333744"
          text-color="#fff"
          active-text-color="#409eff"
          unique-opened
          :collapse='isCollapse'
          :collapse-transition="false"
          router
          :default-active='activePath'
          >

          <!-- 一级菜单 -->
          <el-submenu :index="item.id + ''" v-for="item in menuList" :key="item.id">
            <!-- 一级菜单的模板区域 -->
            <template slot="title">
              <i :class="iconObj[item.id]"></i>
              <span>{{item.authName}}</span>
            </template>

            <!-- 二级菜单 -->
              <el-menu-item :index="'/' + subItem.path" 
                            v-for="subItem in item.children" 
                            :key="subItem.id"
                            @click="saveNavState('/' + subItem.path)">
                <!-- 二级菜单的模板区域 -->
                <template slot="title">
                  <i class="el-icon-menu"></i>
                  <span>{{subItem.authName}}</span>
                 </template>
              </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>

      <!-- 右侧内容主体 -->
      <el-main>
        <router-view/>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      menuList: [],
      iconObj: {
        '125': 'iconfont icon-user',
        '103': 'iconfont icon-tijikongjian',
        '101': 'iconfont icon-shangpin',
        '102': 'iconfont icon-danju',
        '145': 'iconfont icon-baobiao',
      },
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      window.sessionStorage.clear();
      this.$router.push("/login");
      this.$message("您已退出...");
    },

    // 获取所有的菜单
    async getMenuList() {
      const {data:res} = await this.$http.get("menus")
      if(res.meta.status !== 200) return this.$message.error(res.meta.msg);
      this.menuList = res.data
      // console.log(res);
    },

    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },

    // 保存链接的激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  },
};
</script>

<style scoped>
.home-container {
  height: 100%;
}

.el-header {
  background-color: #373d41;
  color: #fff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-left: 0;
  font-size: 20px;
}

.el-header > div {
  display: flex;
  align-items: center;
}

.el-header > span {
  margin-left: 20px;
}

.el-aside {
  background-color: #333744;
}
.el-aside>.el-menu {
  border-right: none;
}


.el-main {
  background-color: #eaedf1;
}

.iconfont {
  margin-right: 10px;
}

/* 折叠 */
.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
    
}
</style> ]